I don't understand why there is a debate about mallet at this point..? hasn't everyone been to Brick Lane Polo yet and seen what the standard is? Nothing against wood mallets but they are a bit dangerous for other users because of the weight.
When is that northeast polo thing supposed to happen? Could it be good for the Saturday games (londonfgss.com/thread5640.htm­l) I suggested a while back?

I don't get this heavy wood mallet thing. If you make a mallet out of seasoned oak it will be heavy but if you make it out of pine it will be light. Different woods different properties just like any other material.